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Color palette (sort of)

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This commit is contained in:
Steven Robertson
2011-05-01 15:23:45 -04:00
parent a43973f0ff
commit b710de4865
1 changed files with 33 additions and 8 deletions
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41
cuburn/code/iter.py
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@ -2,7 +2,7 @@
The main iteration loop. The main iteration loop.
""" """
from ctypes import byref from ctypes import byref, memset, sizeof
import pycuda.driver as cuda import pycuda.driver as cuda
from pycuda.driver import In, Out, InOut from pycuda.driver import In, Out, InOut
@ -25,6 +25,11 @@ class IterCode(HunkOCode):
bodies.append(iterbody) bodies.append(iterbody)
self.defs = '\n'.join(bodies) self.defs = '\n'.join(bodies)
decls = """
// Note: for normalized lookups, uchar4 actually returns floats
texture<uchar4, cudaTextureType2D, cudaReadModeNormalizedFloat> palTex;
"""
def _xfbody(self, xfid, xform): def _xfbody(self, xfid, xform):
px = self.packer.view('info', 'xf%d_' % xfid) px = self.packer.view('info', 'xf%d_' % xfid)
px.sub('xf', 'cp.xforms[%d]' % xfid) px.sub('xf', 'cp.xforms[%d]' % xfid)
@ -65,7 +70,7 @@ void iter(mwc_st *msts, const iter_info *infos, float *accbuf, float *denbuf) {
const iter_info *info = &(infos[blockIdx.x]); const iter_info *info = &(infos[blockIdx.x]);
int consec_bad = -{{features.fuse}}; int consec_bad = -{{features.fuse}};
int nsamps = 500; int nsamps = 2560;
float x, y, color; float x, y, color;
x = mwc_next_11(&rctx); x = mwc_next_11(&rctx);
@ -106,11 +111,14 @@ void iter(mwc_st *msts, const iter_info *infos, float *accbuf, float *denbuf) {
// TODO: dither? // TODO: dither?
int i = ((int)((y + 1.0f) * 255.0f) * 512) int i = ((int)((y + 1.0f) * 255.0f) * 512)
+ (int)((x + 1.0f) * 255.0f); + (int)((x + 1.0f) * 255.0f);
accbuf[i*4] += color < 0.5f ? (1.0f - 2.0f * color) : 0.0f;
accbuf[i*4+1] += 1.0f - 2.0f * fabsf(0.5f - color);
accbuf[i*4+2] += color > 0.5f ? color * 2.0f - 1.0f : 0.0f;
accbuf[i*4+3] += 1.0f;
// since info was declared const, C++ barfs unless it's loaded first
float cp_step_frac = {{packer.get('cp_step_frac')}};
float4 outcol = tex2D(palTex, cp_step_frac, color);
accbuf[i*4] += outcol.x;
accbuf[i*4+1] += outcol.y;
accbuf[i*4+2] += outcol.z;
accbuf[i*4+3] += outcol.w;
denbuf[i] += 1.0f; denbuf[i] += 1.0f;
} }
@ -137,16 +145,33 @@ def silly(features, cps):
cps_as_array[i] = cp cps_as_array[i] = cp
cp = Genome() cp = Genome()
memset(byref(cp), 0, sizeof(cp))
infos = [] infos = []
# TODO: move this into a common function
pal = np.empty((16, 256, 4), dtype=np.uint8)
sampAt = [int(i/15.*(nsteps-1)) for i in range(16)]
for n in range(nsteps): for n in range(nsteps):
flam3_interpolate(cps_as_array, 2, (n - nsteps/2) * 0.001, 0, byref(cp)) flam3_interpolate(cps_as_array, 2, (n - nsteps/2) * 0.001, 0, byref(cp))
cp._init() cp._init()
infos.append(iter.packer.pack(cp=cp)) if n in sampAt:
pidx = sampAt.index(n)
for i, e in enumerate(cp.palette.entries):
pal[pidx][i] = np.uint8(np.array(e.color) * 255.0)
infos.append(iter.packer.pack(cp=cp, cp_step_frac=float(n)/nsteps))
infos = np.concatenate(infos) infos = np.concatenate(infos)
dpal = cuda.make_multichannel_2d_array(pal, 'C')
tref = mod.get_texref('palTex')
tref.set_array(dpal)
tref.set_format(cuda.array_format.UNSIGNED_INT8, 4)
tref.set_flags(cuda.TRSF_NORMALIZED_COORDINATES)
fun = mod.get_function("iter") fun = mod.get_function("iter")
fun(InOut(seeds), In(infos), InOut(abuf), InOut(dbuf), t = fun(InOut(seeds), In(infos), InOut(abuf), InOut(dbuf),
block=(512,1,1), grid=(nsteps,1), time_kernel=True) block=(512,1,1), grid=(nsteps,1), time_kernel=True)
print "Completed render in %g seconds" % t
return abuf, dbuf return abuf, dbuf